Chikubu is a small island in the northern part of Lake Biwa in Shiga Prefecture, in the Kansai region of Japan. It has been known since ancient times for the beauty of its scenery and for its small Shinto shrine and Buddhist temples. Administratively, the island is part of the city of Nagahama, Shiga. The island is both a nationally designated Place of Scenic Beauty and Historic Site.

Nagahama is a city located in Shiga Prefecture, Japan. As of 1 November 2021, the city had an estimated population of 116,043 in 46858 households and a population density of 120 persons per km2. The total area of the city is 680.79 square kilometres (262.85 sq mi).